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Commitments and Contingencies - Nuclear Spent Fuel and Waste Disposal (Details) (Palo Verde Nuclear Generating Station [Member], Public Service Company of New Mexico [Member], USD $)	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Nuclear Spent Fuel And Waste Disposal [Member]
Public Utilities, Commitments And Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss	$ 58,000,000
Revised Annual Fee, Nuclear Waste Disposal	0
Nuclear Spent Fuel And Waste Disposal [Member] \| Other Deferred Credits [Member]
Public Utilities, Commitments And Contingencies [Line Items]
Loss Contingency Accrual	12,400,000	12,300,000
Nuclear Spent Fuel And Waste Disposal [Member] \| Settled Litigation [Member]
Public Utilities, Commitments And Contingencies [Line Items]
Lawsuit settlement, third party receipt	57,400,000
PNMs share of lawsuit settlement, third party receipt	5,900,000
Department of energy, spent nuclear fuel removal July 2011 - June 2014 [Member]
Public Utilities, Commitments And Contingencies [Line Items]
Lawsuit settlement, third party receipt	42,000,000
PNMs share of third party settlement claim	4,300,000
Litigation Settlement, Portion credited to customers	$ 3,100,000